Fireproof floor.



J. KAHN.

Patented-.June 23, 1914.

2 SHEBTS-SHBET 1.

FIRBPROOP FLOOR.

APPVLIOATIQN P ILBD HOV. Z3, 1912.

wmvfssfs.-

www

, to carr JULI'US KAHN, OF DETROIT, MICHIGAN.

FIREPRooF FLOOR. y l" specification of'tettes Patent.

Patented June 23, `1914..

pplication led November 23, 1912. Serial No. 733,034.

To all 'whom it may concern.' Be it known that I, JULIUs KAHN,a c1t1- lzen of the United States, and a resident of Detroit,'in the county of Wayne and State of Michigan, have invented a new and useful Fireproof Floor, of which the following is a specification.

This invention relates to the construction ofv reproof floors and other horizontal slabs, and its object is to produce a structure which can be erected without the use of falsework, which will be in proper condition to receive the flooring without the necessity of concretefiller between the floor sleepers, which shall be light, and which can be erected at moderate cost.

This invention consists in the eombination of a series of trussed girders, each formed of twobars of steel properly slitted and expanded, and provided with a groove along lts upper edge to receive a floor sleeper, of sheets of ribbed expanded metal secured to the lower flanges of the girders, sheet metal forms resting upon the ribs of the expanded metal between the girders', concrete in the spaces between adjacent forms and extending over the tops of the same and embedding the girders, the top of the concrete being generally level with the tops of vthe girders, and iooring extending across the'top of the concrete andthe girders and secured to the sleepers.

This invention further consists in forming the lower tension members of the trussed girdersof suicient strength to act as rein orcing members' of the concrete beams in which they are embedded, andv therefore of sufcient cross sectional area the total dead and live load on the floor, t e inclined members, resulting from the expansion of the intermediate portions of the bars from which the trusses are made, serving to transmit tensional stresses to the concrete, and as diagonals of a trussed girder for carrying thel temporary dead 'load while the floor is being built, and the upper chords of these girders being of such area that they will have ample compressive strength to carry the floor during the time that the concrete of'theloo'r is being constructed, butnot sufficient to carry the live load to which the Hoor issubjected after it is completed.

A, 'Illthe accompanying drawing Figure 1 is a-ftransverseisectionof a Hoor constructed is a longitudinal section of the same. Fig. 3 is a side elevation of the'end of one of the grrders Ona larger scale than Figs. 1 andQ. Fig. t is an end view thereof. Fig. 5 is a side elevation of one end of one of the halfgn'ders from which the girder is formed. Fig, 6 isan end view thereof. Fig. 7 is a sec-tion o'n the line 7--7 of Fig. 3. Fig. 8 is a section on theline 8-8 of Fig. 5.

Slmilar reference characters refer` toflike parts throughout the 'several'views The truss or girder shown in the drawing is similar to that shown in my (I0-pending' application No. 733035, led Nov. 23, 1912. These trussed gir-ders are formed of two expanded metal members, that are formed and Jomed in a manner hereinafter indicated.'

Each of the members comprises a h'alf compression chord, a. half tension chord, two half-diagonals- 2 and 3, and a plate 100 or 101"that is formed integral with the member and joins the ends of the half-diagonals. The half-compression chord comprises a laterally Vextending flange 4, an outturned flange 5, and an in-turned web 30, the flange 5 being preferably formed near its outer.

formed integrally with thev other expanded i metal member are similar vclips also designated 7 and 8.

As indicated in Fig. 1, some of the clips (preferably alternate clips). may be formed on each of thehalf compression chords, and l in a similar manner some may be formed on each of the half tension chords;` but it is obvious that all ofthe clips might be formed on one of the half chords'if desired.

The plates are formed integral with the adjacent ends of the half-diagonals 2 and 3 of oneof the expanded'metal members, and they plates 101 are integral with the adjacent ends of the half-diagonals of the other member, and these platesextend longitudinally somewhat lbeyond the ends of the corresponding half-diagonals, ras indicated at 102. i'

The two expanded metalmembers are assembled in reverse relation to each other as shown, and the clips 7 'and 8, that are integral with'one of the expanded metal members, are bent to inclose the edges of the webs and 36 and the ribs 32 and 37, respectively, thereon. The longitudinal extensions 102 on the plate 100 are bent to inclose the edge of the plate 101, and the extensions 102 of the plate 101 are likewise bent to inclose the edge of the plate 100. In this manner the members are rigidly secured together.

In the groove or trough formed by the horizontal parts 4 and vertical parts 5 of each girder, a wooden sleeper 11 may be placed, which may be held in position by 'Sheet metal clips 12 spaced at proper intervals. Sheets of metalluth 14 provided with upwardly extending ribs 15 may be secured against the bottom flanges 1 by meansw of wires 16 as shown in the drawings. ,Upon "jthesesheets of ribbed metal are placed forms offsheetmetal, preferably constructed with corrugated sides d18 and tops 19, to produce .air spaces inthe floor. Concrete 20 is then placed between adjacent forms so as to em- 'bed the girders, and this plastic material will flow down between the ribs 15 of -the metal lath and around theplower 'flangesl of the girders, as indicated at 17 in Fig. 1. The concrete extends over the tops of thesemetal forms and its upper surface is preferably level with the top of the sides 5 of the troughs in which, the sleepers 11 rest. The flooring 21 may then be nailed directly to the sleepers 11,.

By forming the vtops of the girders troughshaped, suflicient metal is employed to more than equal the compressive strength of the concrete displaced. The -floor is therefore not weakened by the embedding 'of the sleepers 11 therein. The usual concretel filling employed between floor sleepers is saved as the floor 21 can be secured directly against the concrete 20 or against a sheet 22 of paper or other substance adapted to'act as a-c1'1shion between the floor and the concrete if desired. It will be understood, of course, that this sheet can be omitted. These girders are preferably so constructed that the top chords ave suflicient compressive strength to .permit the girders to carry the floor until the concrete has set, after which the top chords this metal lath are of sufficient stiffness toand the concrete will act together as the compression member of a relnforced concrete beam. The ribbed' metal lath can beg-"made with a mesh of suflicient fineness to prevent. the passage of concrete, and as the ribs o'f carry thev sheet metal forms and the concrete resting thereon through the short span between the edges of the adjacent forms, it will be apparent lthat no falsework` is necessary in the construction of the floor illustrated.- The highexpense of this falsework and also panded metal of the usual cinder concrete employed to fill the spaces between th'e floor sleepers are therefore saved, and because of this savlng of the concrete and its Weight, a saving in the steel employed to reinforce the concreteI joists of the floor results. No falsework being necessary, vthe floor can be erected in much less time than-is usually'required, so that this construction is one of great cheapness. Furthermore, as the floor sleepers are embedded in the concrete joists, a saving in thickness of the floor is accomplished. If desired, a layer-24 of plaster may be applied to the lower face of the metal-lath 14.

I claim- 1. As an article of manufacture, an expanded metal member comprising a half compression chord, .a half tension chord, two half diagonals, and a plate joining the ends of the half -diagonals` said plate being extended longitudinally beyond the endsof the half diagonals. V

2. As 'an article of manufacture, an expanded metal member comprising a half compression chord, a half tension chord, two half diagonals, a plate joining the ends of the half-diagonals and clips extending inwardly from one .of the half-chords.

3.1As an article of manufacture, an exv panded metal member lcomprising a half compression chord, a .half tension chord, a series of half-diagonals in pairs, means for joining the half-diagonals of each pair at their ends, and clips extending inwardly from each of the half-chords. f

4. As an article of manufacture, an eX- member comprising4 a .half

compression chord, a half series of half-diagonale, and a plate ]oin1ng the ends of the `half diagonale of each pair,

tension chord, a

said half compression chord including a vlaterally extending flange, an inwardly extend- 'ing'v web, and clips extending inwardly from thev web, and said half tension chord 1ncluding a laterally extending flange, anv inwardlv extending web and clips extending inwardly from the web.

member comprising a. half 5. As an a'ticle' f manufacture, an expanded meta compression chord, a half tension chord, and

two half-.diagonals joined at their ends,-said half compression chord including a. laterally l extending flange, an `outwardly extending flange, an inwardly extending web, said half l tension chordhaving a laterally extending flange and an inwardly extending web, one

of the half-chords beingprovided' with in- Q wardly extending clips.

6. Asan article of manufacture, an exi' panded metal member comprising a half eompressionehord, a half'tension chord and two half-diagonalsjoined at their ends, each of :said half-chords including a laterally extending flange and an int'urned web having a longitudinal rib thereon, and one of the ias ' Ahalt-chords includingI inwardly extending clips on the half bent to engage with the clips. v.,

7. A girder composed of two members, each comprising a half compression chord, a half tension chord, two half-diagonals, a plate joining the` ends of the half-diagonals, and clips extending inwardly from one of the chords, said members being arranged in reverse relation to each other, the clips on each of the members being bent to engage with portions of the other member, and portions of each of the plates being bent to engage with the other plate to secure the members rigidly together.

8. A girder composed of two members, each comprising a half compression chord, a. half tension chord, two half-diagonals and a plate Joining the ends of the half-diagonals, said plate being formed to extend longitudinally beyond the ends of .the half-V diagonals, said half chords each comprising a laterally extending flange and an inwardly extending web, clips on one of the half compression'chords and clips on one of the half tension chords, said members 'beingI assembled in reverse relation to each other, the compression chord being other half compression chord, the clips on the half tension chord beingbent-to engage vwith the other half tension chord, and the longitudinal eX- tension 'of each of the plates being bent t0 engage the other plate to secure the members rigidly together,`

9. A girderV comprising two members, each comprising a half tension chord, a, half compression chord, and two half-diagonale joined at. their ends, the half compression chords each including a laterally extending flange, an outwardly extending eattached At0 the edge t ereof, an mwardly extending web and clips extending inwardly l from the web, said half tension chords each including a.' laterally extending flange, an

ing inwardly from the web, said members being arranged in reverse relation to each other, the clips on each 'of the half-.chords being bent to engage with ythe other halfcbord, and the ends of all the half-diagonals being secured together.

10. A new article of manufacture consisting of a girder composed of' two bars properly slitted and expanded to form top and bottom chords connected by means of members inclined in the same direction from both chords and united substantially midway between the chords, the bars each having integral tongues adapted to be bent overv and around adjacent parts of the companion bar, the top edges ofthe bars being separated to form a trough at the upper edge of the girder.

11. A. girder composed of two members,

each comprising a half compression chord, 05

a half tension chord, two half-diagonals, a plate joining the ends of. the half-diagonals and clips extending inwardly from one o the chords, said members arranged in re-\ verse relation to each -other, the clips on each of the members being bent to engage with portions 'of the other member, and means for vsecuring the plates rigidly together..

In testimony whereof I have signed this 75 specification in the presence of two subscribing witnesses.

JULIU S Witnesses: v HUGO W, KREINBRING, vEDWARD N. PAemsnN.

inwardly extending web, and clips extend- 4s 

